Why did populists want the united states to move from a currency backed by
gold to one backed by both gold and silver?

In 1893, the country was in thrown into a depression that lasted until roughly 1900 from the bursting of the railroad speculation bubble. Populists, who were primarily farmers, wanted to reinstate the system of bimetallism that had traditionally been in place in an effort to inflate the currency to provide them with more cash that could then be used to pay off their debts with cheaper dollars.So, It would increase the supply of money.

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it would increase the supply of money-Apex

Explanation:

branches of government. to ensure a separation of powers, the u.s. federal government is made up of three branches: legislative, executive and judicial. the legislative branch is made up of the house and senate, known collectively as the congress.